Starter Heat Soak

SD diesels were widely available in the US in the 1981-86 Datsun/Nissan 720 pickups, and in Canada through '87 in the D21 pickup.

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philip
Posts:1494
Joined:15 years ago
Location:Southern California, USA
Starter Heat Soak

#1

Post by philip » 14 years ago

Something that has been a characteristic of this truck, even before I acquired it is ... the starter going on the fritz after getting heat soaked on a hot day. This usually happens after a lot of stop and go traffic or shortly after a freeway run on a hot day. Let the truck sit for 10-20 minutes ... click click click from the starter solenoid. Up until now, the workaround has been to short between the starter solenoid wire and the starter positive post with a short screwdriver. Starts right up like nothing was ever wrong.

On suggestion from a Maxima owner on the MSN group, I took a close look at what is an easily overlooked souce for this problem; the negative cable / body / vehicle harnass ground point on the battery box.

INTERESTING discovery.

The sheet metal battery support was still painted white AND the side of the battery ground cable facing the painted surface was burned black! The other side of this cable connection facing the harnass ground terminal (eyelet) was fairly clean.

So I got out the heavy duty wire brush and removed all the white body paint from the sheet metal and all burned debris from the negative cable connector. Reassemble.

So far today ... and the truck was out in 100 degree temperatures with several hot soaks, NO MORE click click click from the starter solenoid! A few more days of this heat will tell.
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

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Zoltan
Posts:136
Joined:14 years ago
Location:Honolulu, HI

#2

Post by Zoltan » 14 years ago

Hey Philip,

since I rebuilt the ignition switch and got rid of the push start button and the flip switch, I never had a starting problem. Just wanted to let you know...
- Zoltan -
________________________________
'82 Datsun 720 SD22 California model
'86 Ford Escort 2.0L Diesel

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philip
Posts:1494
Joined:15 years ago
Location:Southern California, USA

#3

Post by philip » 14 years ago

Zoltan wrote:Hey Philip,

since I rebuilt the ignition switch and got rid of the push start button and the flip switch, I never had a starting problem. Just wanted to let you know...
Maahvolous! :) But DO check this vehicle harnass grounding point. IF your truck's original battery ground cable has been replaced, this questionable vehicle harnass ground remains. This is how the starter solenoid (and everything else in the harnass) completes circuit to ground.

DO inspect, disassemble, and wire brush all conducting surfaces of this battery box grounding point.
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

User avatar
philip
Posts:1494
Joined:15 years ago
Location:Southern California, USA

#4

Post by philip » 14 years ago

philip wrote: SNIP
DO inspect, disassemble, and wire brush all conducting surfaces of this battery box grounding point.
Image

It's been about 4-5 days since cleaning up the wiring harness ground at the battery box. So far, I'd say MOST of the apparent hot soak phenomenon cleared up. The truck has exhibited the dreaded heat related "click click click....." only ONCE. And even then, it took only 5 or 6 attempts before the starter complied.
-Philip
Passed 08May2008
My friend, you are missed . . .

1982 Datsun 720KC SD-22

"Im slow and I'm ahead of you"

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